Your measurements
Result
0
A concrete stairs calculator estimates the concrete in a set of solid steps poured on the ground — the kind at a porch, a deck landing or a retaining wall. Enter how many steps, the rise and run of each, and the width, and it returns the total volume with 10% waste.
The trick with steps is that each one sits on top of the fill below it, so a flight of steps is a stack of blocks of increasing size. The calculator handles that stacking for you rather than treating every step as the same size.
Each step is modelled as a rectangular block; because step i sits on the fill of all the steps below it, the solid cross-section is run × rise × (N·(N+1)/2). Multiplying by width gives the volume. This assumes solid steps poured against compacted fill, which is the usual method on grade.
Four steps at 7-inch rise, 11-inch run and 3 ft wide work out to about 16 cubic feet, or 0.59 cubic yards — roughly 0.65 yards with waste, or about 34 80 lb bags for a DIY pour.